I will discuss scalar and tensor charmonium resonances determined using lattice QCD. Working at MeV, more than 200 finite-volume energy levels are computed and these are used in extensions of the Lüscher formalism to determine infinite volume scattering amplitudes. Working in the approximation where charm-annihilation is forbidden, the ground state and states are stable. Below 4000 MeV we find a single and a single resonance, both strongly-coupled to several decay channels consisting of pairs of open-charm mesons. Both resonances are found on the closest unphysical sheet just below MeV with widths of 60 MeV. The largest couplings are to the closed channels in -wave, but several open-charm channels are also found to be large and significant in both cases. All closed-charm channels are found to be approximately decoupled. No additional states are found beyond what would be expected from quark-model-like excitations.